Hi, I 've managed to run successfully the example provided by the Microsoft Q302901 - "How To Build an Office COM Add-in by Using Visual C# .NET" article http://support.microsoft.com/default.aspx?scid=kb;en-us;302901 I want to change the button_click event code so that, when the button is p...more >>

I have had a lot of practice creating .NET COM Interop objects in C# that can be registered and called from existing COM clients. I am trying to perform the same process in VC++ (without writing an ATL object) via a class library project -- just like I would with C#. I create a .NET VC++ c...more >>

Hi, Trying to enumerate interfaces on RRAS. Bellow is what I have so far. The MprAdminInterfaceEnum has an lplpbBuffer out parameter which is a buffer that will contain an array of MPR_INTERFACE_0's. I want to access the wszInterfaceName for each interface. How should I marshal t...more >>

I'm creating a library (based on the code of an article written by Bill Vaugh) to convert ADO.net Datatables y Datasets to ADODB.Recordsets. I just got a new dev machine with WinXP with SP2 and now when I try to use the ADODB.Recordset object I get the error "QueryInterfce for interface ADO...more >>

Hi, I have a C# assembly that is being called from VC6 via COM. I open the C# project in .Net, set a breakpoint, set debug type to "program", and specify my C++ app. F5 runs the C++ app, but my breakpoint never fires?! The C# dll is not in the GAC, and the build path is different to the...more >>

Hello: I am having a marshalling problem between VB.NET 1.1 and CDO from Crystal Reports 8.5. The AddRows generates a COMException that I don't understand. This is supposed to be default marshalling from what I can figure out; Object to ByVal Variant The code snippet is as follows: ...more >>

I have a .NET web service proxy client that is intended to be invokable from ASP 2.0 (Classic as follows) MyOrg.web.publications.OrderData - Data class that is at the highest level MyOrg.web.publications.iOrderData - Interface for MyOrg.web.publications.OrderData MyOrg.web.publications.Order...more >>

Can COM dll be used using dllImport coz i dont want add its reference using add refrence dialog box. ...more >>

Hi, I need to pass a two dimensional array from VB.NET to a C DLL function. The prototype for the C function is as follows: int _stdcall myFunction (int **matrix) I have created an array in VB as Dim t(2,2) As Integer and initialized. Please let me know how to do this.. Thanks...more >>

I ran into a couple of problems when trying to sign SHDOCVW.DLL After I run tlbimp.exe on the above mentioned dll I get a signed MyInterop.SCHDOCVW.DLL, BUT it is quite different from the AxInterop.SHDocVw.dll generated by the Visual Studio when you add a reference to the same dll above. ...more >>

Hi, I am developing a windows application which uses the browser control and DHTML as the UI, i have designed a class that implements the IDocHostUIHandler so that i can block the accelerator keys (F5, Ctrl+F5, Ctrl+5, and so on), i have script that runs in pages that will be displayed in...more >>

Hey Group, Today we gonna discuss Soapsuds tool. Soapsuds is shipped with .Net FrameWork and is used by .Net remoting Client Applications to generate xml schema,proxy class or assembly for their HTTP Remoting Server. Client App can use this proxy class or the assembly as a reference to the...more >>

Hi, is it possible to pass a callback function from VB6 to VB.NET? I've tried the following and got the error "Function pointer was not created by a Delegate.". ______________________________ ' VB.NET class library: Biblioteca.Class1 Imports System.Runtime.InteropServices Imports Syst...more >>

I have a VB6 DLL that queries an MSAccess XP database and the DLL is used by a .NET Webservice. The WebService and DLL are on a Windows 2003 Web Server. The WebService runs in its own Application Pool on IIS. The DLL has been registered with COM+ and is marked as 'Synchronisation Required'. ...more >>

I have a managed ( __gc ) class and a unmanaged ( __nogc ) class in the same VC++ 2003 project (since I need to create a dotnet wrapper for some old c library code). I can easily reference unmanaged class from the managed one, but I'm having problems when I need to call managed class method from ...more >>

I am trying to use C# .NET interop with Excel 2003 and I am running into a couple of problems. In this example, a .NET class called Ticker is in a .NET assembly dll called AClassLibrary. Ticker exposes a COM interface with a GetTick and a Dispose method. It also exposes a COM event with one e...more >>

Hai All, I am having an EXE developed in VB6. For certan functionality reasons i want to call this in my C# program, Can i call this unmanaged EXE from my C#. I know i can call a DLL using DllImport. Is it the same with EXE. Help Me Thanks, V.Boomessh...more >>

Hi, I'm just getting started with Interop, and I would appreciate any help you might give me on this question (and others upcoming, I'm sure). I have been assigned a project which requires me to interact with a regular non-COM DLL. I don't have any definitions for the library functions, but ...more >>

Dear All, I have a two questions about interoperating with unmanaged code. I'm trying to call a function from a DLL file called usp.dll which contains Uniscribe functions from C#. I'm calling a function called ScriptItemize which is defined with its structures as follows: HRESULT WINAPI ...more >>

Hello, It happens that one days I had to write program that uses Windows API, but seems C# do not have anything as convenient as "windows.h" in C++, so I had to declare the functions myself. While most of the codes I found on the net involving C++, I have to do some ports in...more >>

Hello, I am trying to do some late binding to an COM-Server. Now I have the following problem: The IDL-Description of the Method looks like this: VARIANT_BOOL StartObjectQuery( long ObjectType, long* TotalNoOfObjects); Now I try to execute this method with the following C# cod...more >>

Hello! (and sorry for my english, but I'm italian :-)) I'm using in VB.NET some ActiveX dll built with VB6. Everything work well, when I build my .NET executable, interops for my dlls are created. My co-worker, that don't use Visual Studio .NET (not installed in his PC) somewhere modify COM dl...more >>

I need to use word to edit aq document, programitically, adn then save it to a file (which will then be loaded into the database as a BLOB. Is Interop the right way to accomplish this? Can anyone give me a pointer to some sample code? -- David Gordon-Brown...more >>

I have a winforms app that creates a COM application(namespace imported through references). I would like to be able to know when the COM application is closed by the user in the .NET app. The COM app does not fire an event when it's closing - there is no published event. Is there a way to find...more >>

We need to use a previously developed .NET application with a existing VC++/MFC application. Idea is to convert the .NET application to an ActiveX control which can be inserted in the ActiveX Container Application. However there seems to be no way to do this. A .NET component without a GUI ca...more >>

Please help. I've been stuck on this for days. I have a sample web service, written in C# that I'd like to have be able to call into a DLL written in C++ (also in the .NET Studio). I can compile and build both pieces, but I'll be hanged if I can get the call to work at run-time. My service cod...more >>

I have a .Net object that I expose to COM. I implement this as a singleton and create my own class factory. In keeping with the fact there should only be one instance of this object, I want to have only a private constructor. However, regasm generates the type library and marks the object noncre...more >>

This might be a simply question but I'm new to some of this... I have a sln which when built creates 4 DLLs and automatically generate associated Interop DLLs. The 4 Dlls will need to be signed by the person here that has the private key for our company. But do Interop DLLs need to be signed...more >>

Hi, I have converted a couple of C++ structures to C#. /* typedef ULONGLONG BTH_ADDR; typedef struct _BLUETOOTH_ADDRESS { union { BTH_ADDR ullLong; // easier to compare again BLUETOOTH_NULL_ADDRESS BYTE rgBytes[ 6 ]; // easier to format when broken out }; } BLUET...more >>

Hello, I created a COM Server .NET dll that works fine as an InProcServer. It creates it's own OdbcConnection and saves the passed data to DB. But the DB-connection of the application using this COM server gets messed up when the new connection is opened (some wierd ODBC 2 vs ODBC 3 stuff). Th...more >>

Having trouble unmarshalling the list of rights returned by LsaEnumerateAccountRights() Declared it as... [DllImport("advapi32.dll", SetLastError=true, PreserveSig=true)] private static extern long LsaEnumerateAccountRights( IntPtr PolicyHandle, IntPtr AccountSid, ...more >>

I have two COM Callable Wrappers created by tlbimp. One of them I can create successfully in my C# application (CCWClass obj = new CCWClass()). The other, on call to new(), throws an exception - "the parameter is invalid" - or ERROR_INVALID_PARAMETER. If I go into disassembly mode, I see ...more >>

Hello again, I haven't done too much work with the web browser component hence the rapid fire questions. Im now wondering how to turn off the header and footer (page url - date/time) for IE when a user prints from IE as hosted within inside of our app. I remember doing something with a BHO a wh...more >>

HI There, I have seen a recent post asking precisely the same question for precisely the same scenario as mine. Unfortunately it was via Matt Reynolds .NET 247 and they dont seem to supply date/times of posting. The url for that post is here (rather than me repeat the question) http://www...more >>

This is driving me nuts. I'm trying to update an Excel spreadsheet using ADO.Net and Oledb in VB.Net. The connection is open, the adapter is connected and the dataset is loaded. Here's the code in question: myDataRow = myDataSet.Tables(0).Rows(RowNum) myDataRow(ColumnCount)...more >>

Hey Group, Today we look in to creating software digital certificates but we take a plunge in that we will look at certain aspects of Crytography. Cryptography is about keys for encryption. These keys can be symmeteric or asymmetric. When we say symmetric keys what we mean is that the same k...more >>

Hi everybody, I am trying to create an add-ins for Microsoft Excel using C#. I started with Microsoft's article 302901 - How To Build an Office COM Add-in by Using Visual C# .NET http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/q302/9/01.asp...more >>

I am working with a thermal printer that returns it's status in a string. The status can be up to 4 bytes long. In vb6.0 I would use the MidB,AscB functions to examine the first 32 bits. What can I use in vb.net instead of The MidB and AscB. Thank you ...more >>

I am programming in C# and am not sure how to supply the last parameter (LPSTR) in the SendMessage function with the WM_GETTEXT option. Do I need to use unsafe code and how do I get the pointer and pass it to the SendMessage function to get the text that it contains? Thanks, Dennis ...more >>

Hallo, I'm trying to automate my VB.Net application for non .Net-Apps, to have only one instance of the my app I used the following pattern. My .Net-App <= ".net remoting" => RemoteService <= "COM" => non .net Client-App All of this works fine if I don't use any interface - but when I use ...more >>

I'm having an issue with installing an addin for Word. I've written the addin in C# and I am using the Setup project that was created with the Extensibility project by VS. If, as an administrator, I install the addin for "Just Me". everything works fine. If I install for "Everyone", however...more >>

Hello, I have a .NET object that uses the HTTPWebRequest class to contact another http server and send some information to it. I would like to use this .NET object from a classic ASP page but I do not want the end user to be delayed on account of the .NET object carrying out it’s tasks....more >>

Hi, My app uses the API structure MIDIHDR to receive MIDI long (system-exclusive) messages and I have got a declaration problem. The SDK declaration (in C) on MIDIHDR reads: typedef struct { LPSTR lpData DWORD dwBufferLength DWORD dwBytesRecorded DWORD dwUser ...more >>

Hi all, I have a problem setting the formula in a cell from my dot net app only on a French computer. If I try the same thing with VB6 code it works fine. Here is my vb.net code Dim a As Microsoft.Office.Interop.Excel.Application Dim b As Microsoft.Office.Interop.Excel.Workbook a = New...more >>

I have an UC++ DLL which is called from a MC++ DLL. During execution we get SEHExceptions sometimes. The UC++ DLL is all our own code except for MFC and CRT. I've been able to force NullReferenceExceptions (*NULL = 2, read memory out of bounds, write memory out of bounds), and DivideByZero ex...more >>

I am creating a simple test program to demonstrate calling unmanaged C++ from a managed C++ wrapper class All created and built in Visual Studio 2003 I have a very simple unmanaged class with empty constructor/destructor and one other method as double add (double X, double y). This is bui...more >>

Hi Here's a weird one which I would appreciate help with which I can't get my head around..... If I create a .NET assembly that has a method in... string[] GetFormats() expose it as a COM components (via regasm), then create a new .NET app that references that COM component, my call ...more >>

I'm trying to implement calls to an existing C-based DLL within a C# program. It sounds straightforward enough, but any calls to the extern functions produce a NullReferenceException. My code looks like this: [DllImport( @"e:\jbhexe\sscam.dll", EntryPoint="BAM_calcs" )] public static extern ...more >>

Hi! I am runing out of ideas now. I have scanned several ng's but not found an answer. So this is the last try :( I have VS 2003 Enterprise, Office 2003, and i made sure that the .NET framwork was applied with "Run on machine". after office i opened VStudio. Entered, using Microsoft.Offic...more >>

I am so close to getting my manual COM interop classes to load correctly! I have very slowly tracked down the problem to missing .override directives on the classes in the IL generated from my assembly compared to that of TlbImp. I don't really understand why the directives exist in the firs...more >>